At the butler café, Lady Braganza, the five apprentice butlers known as the Happy Boys awaits you to deliver happiness to your table. It's their mission to bring happiness to the ladies who visit the café and to become the perfect butler. After intricate and extensive butler training, the Happy Boys are finally beginning to perform their duties with comfort and confidence. But one day, one of the butler finds out a mademoiselle has a crush him. At Lady Braganza, the first and major rule is never to be involved with a customer. Can he deliver his professionalism without tarnishing butler café's reputation?